ἰού

1. of grief of annoyance, usu. twice repeated, ἰοὺ ἰού D. 19.209; ἰ. ἰ. δύστηνος or δύστηνε, S. Tr. 1143, OT 1071; ἰ. ἰ. βοᾶν, κεκραγέναι, Ar. Nu. 543, Pax 345: c. gen., ἰ. ἰ. τῶν . . κιγκλίδων Jul. Caes. 330d: rarely once, φῦ(φεῦ codd.), ἰ. τῆς ἀσβόλου Ar. Th. 245; or thrice, Id. Pax 110: with other Interj., ἰ. ἰ. ὢ ὢ κακά A. Ag. 1214; ἰ. ἰ. πόπαξ Id. Eu. 143 (lyr.).

2. of joyful surprise, hallo!, hurrah!, Id. Ag. 25, E. Cyc. 464, 576, Ar. Eq. 1096, Pl. R. 432d, Grg. 499b, Smp. 223a. (Sch.Ar. Pax 345,316 says that ἰοὺ ἰού is of woe, ἰοῦ ἰοῦ of joy: the rule is not observed in codd. In Att. Poets it sts. stands extra versum, A. Ag. 25, Ar. Nu. 1.)